Circuit-controller.



I PATENTED APR. 5, 1904.

J. L. SGHUREMAN, JR. CIRCUIT CONTROLLER.

APPLICATION rum) JAN. 11, 1004.

N0 MODEL.

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Patented April 5, 1904.

PATENT OFFICE.

JACOB L. SCHUREMAN, JR, OF CHICAGO, ILLINOIS.

CIRCUIT-CONTROLLER.

SPECIFICATION forming part of Letters Patent No. 756,534, dated April 5, 1904.

Application'filed January 11, 1904. Serial No. 188,522. (No model.)

To all whom it may concern.-

the following is a specification. 7

My invention relates particularly to electromagnetic controllers for electric circuits such as are employed, for instance, 1n controlling the circuits'of electric motors employed for actuating air-pumps.

, My primary object is to provide a circuitcontroller or motor-starter wherein provision against sparking at the switch and provision against heating of the switch-controlling magnet-coil are made and wherein desirable uniformity of movement of the switch, after the closing of the circuit, is insured as the switch moves over the contact-points to cut out successive resistance-coils.

The invention is illustrated in the accompanying drawing, in which- A represents a slab upon which are mounted the parts of the mechanism; B, a series of segmentally-arranged contact-points electrically joined through resistance-coils I); C, a

switch joined by a pivot 0 to the slab; D, a.

magnet supplied with a fixed core-section D at its upper end and a movable core-section D projecting from its lower end; D a stem secured to the core-section D and having pinand-slot connection at (Z with the switch-lever C; D, a tube slidably connected with the lower end of the stem D and equipped with a pin d, working in a slot d in said stem, the lower end of the tube being equipped with a piston D E, a vacuum-cylinder in which the piston Works and which is provided at its lower end with an air-inlet e, regulated by a screw 6; F, a relatively long contact-piece electrically joined by a resistance-coil f to a contact-piece F, thus forming a rheostat; G, an electric motor; G, a conductor connecting one brush of the motor with the upper contact-piece of the rheostat B; G a conductor of the supply-circuit connected with the other brush of the motor and with the spool of the magnet D; G a conductor of said supply-circuit connected with the pivot of the switch-lever; G

a conductor connecting the segment F to the solenoid; H, an insulation-block upon which the free extremity of the switch-lever rests when the controller is not in operation, and I a stop against which the lever bears at such time.

The circuit-wires G G are connected with any suitable electric source, (not shown,) and any suitable switch J is provided for opening and closing the circuit. The switch-lever contacts in the position of rest with both the segment F and the insulation 'H. When the circuit is completed, as by the closing of a hand-switch, the full current passes through the magnet D, which carries the switch-lever C by a quick movement onto the adjacent contact of the rheostat B, thereby avoiding objectionable sparking at the instant of closing the motor-circuit. The lower end of the slot cl now engages the pin d of the piston-stem D and the switch-lever continues to move under restraint to gradually cutout the coils of the rheostat, and thereby gradually increase the current passing through the motor. As the switch-lever nears the upper end of its traverse it passes from the contact F to the contact F, thereby throwing resistance into the magnet-circuit and reducing the current flowing through the magnet. Thus the magnet;coil, which might be dangerously heated by long-continued flow of full current therethrough, is safeguarded by the expedient described.

The construction described is admirably adapted to its purpose, and the vacuum-cylinder and its piston serve in a peculiarly-effective manner to prevent jerking movements of the switch-lever. Moreover, the arrangement with, a switch-restraining device opposing the magnet, and lost-motion connection between the switch and said device, whereby quick movement of the switch at the instant of closing the motor-circuit is effected.

2. The combination of a switch-controlling magnet, a rheostat connected with an electric circuit, a switch coacting therewith and actuated by said magnet, and a switch-restraining device comprising a vacuum-cylinder and a piston therein having lost-motion connection with said switch, for the purpose set forth.

8. The combination of a switch-controlling magnet having a movable core-section, a rheostat connected with'an electric circuit, a switch coacting therewith and connected with said core-section, and a switch-restraining device comprising a cylinder and a piston therein having a stem in alinement with said core-sec tion and having lost-motion connection therewith.

4:. The combination of a magnet having a movable core-section, a stem connected with one end of said core-section, a pivoted switch connected with said stem, a cylinder beneath the switch, a piston within said cylinder provided with an upwardly-extending stem having lost-motion connection with said firstnamed stem, and a rheostat connected with an electric circuit and coacting with said switch.

5. The combination of a motor, a switchcontrolling magnet, an electric circuit having a conductor connected with said motor and said magnet and a conductor leading to a switch, a switch connected with said last-named conductor and actuated by said magnet, a rheostat coacting witlrsaid switch and connected with said motor, a rheostat coacting with said switch and connected with said magnet, the first-named rheostat operating to cut out resistance and the second-named rheostat operating to cut in resistance during one movement of said switch, and a restraining device for said switch opposing the action of said magnet and having lost-motion connection with the switch, for the purpose set forth.

6. The combination of a motor, an electric circuit having a conductor connected with said motor, a magnet connected with said motor, a switch supported on a pivot connected with another conductor of said electric circuit, a rheostat over which the free end of said switch may be moved and which has its upper end connected with said motor, a second rheostat between said first-named rheostat and the pivot tion connection with said core-section.

JACOB L. SCHUREMAN, JR. 1n presence of F. M. NIRTZ, W'ALTER N. WVINBERG. 

